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If you make a change to a page and later the search result in google reflect that change and your position has changed, you can assume that the change affected your position.

However google continuously re-evaluates ranking.

I have a personal theory:

When you add content or make modifications to a page, I noticed in our case that google has a tendency to rank you a bit higher for a while, I think just to see if people click on the page.

If people react positively by clicking and staying on the page, then google might assume that the page is relevant enough to stay there or higher (and vice versa).

I don't know if you need a pro account, but in seomoz you can track the number of links to your website by time and see if you have a drop.

In your campaign, it under "Link Analysis" > History

You can also use the open site explorer to find out more about links to your website:

http://www.opensiteexplorer.org/

I don't think you can...

Your case is valid in a way, since you only intend to deliver each content to specific countries and after all it should not matter if both sites are the same since users from spain should not go on the .mx and vice versa.

However google is not human and might not see it the same way.

I would not take a chance on this and make both sites kind of unique.

You may for example allow people to comment on your pages, this will create a "uniqeiness" since comments from spain should be different from Mexico.

Even very large websites like walmart, staples, etc... are slightly different from country to country.

You could use the google adword keyword tool:

<cite>https://adwords.google.com/o/KeywordTool</cite>

meta keywords are no longer read by google. It's been abused in the past and it's not relevant anymore.

Drop the meta keywords as it gives valuable information to your competition on which keywords you target .

the meta description is still working and relevant, and should be part of your SEO strategy,

Google analytics will tell you.

If you have a .net server, you may use SmarterStats, it's free and very detailed.

They have a free version with all the functions you need.

Your new hosting company provided you a shared IP address which is not a big problem, unless there are some funny business going on with other website on the same IP.

According to this test, 71000+ websites have the same IP as your site

(http://domaintz.com/tools/overview/jurotrans.com)

the .mx and .es will be treated as 2 separate websites, so as far as google is concerned you can use each site to target a specific country.

I am not 100% sure, but if both sites are exactly the same, I think one of the two might be discounted because of the duplicate content.

French Version:

le site .mx and .es sont considere comme 2 differents site pour google. Tu peux utilise un profile pour chaque pays.

Je suis pas 100% certain, mais si les deux sites sont identique, il y a beaucoups de chances que google penalise l'un des deux a cause du duplicata et manque d'originalite.

24 hours is a short time and probably google did not reindex or even looked at your new robot.txt

Webmaster tools is way slower than bing tools, so be patient.

As a rule of thumb, I wait at least a week with google before worrying (my 2 cents)

I think there are 2 ways to do it.

(Quick version) redirect all pages from your old domains to the new domain, however if you have links with specific keywords pointing to old posts, all the weight will be transfered to your new home page and most likely the content will be far different from the original post, and you might loose some positions you used to have on some posts.

(Long version) scrape all the old articles, put them on your new server, then redirect each article independently from your old site to the new site.

ie: redirect from www.myoldsite.com/article123 to www.mynewsite.com/article445

This way you keep all valuable links pointing to these post, but also the context of each link will match the content of the page like nothing happened (if you have such link of course).

I am no expert in blogs, but I did the long version with our online store for each products and it worked like a charm. I kept the contextual links, pagerank and position for each one of them.

I'd stay away from 302 redirections as much as I can, and simply serve a site based on the user agent,

or you may simply offer your clients the choice between the two versions using some kind modal popup.

Here this video might help answer your question.

http://support.dudamobile.com/entries/20308913-does-redirecting-to-a-mobile-site-create-seo-issues

Your pagerank has been assigned to the non www site, now that you change that using redirections, google needs to recrawl and reassign the pagerank to the www pages.

Now keep in mind that even if the pagerank in the google bar stays gray it does not mean that your site has been dropped, they only update the bar from time to time.

Wait a couple of days and search google for your pages, if you find them and it shows the new url, then you should be ok.

If you are using ajax, I guess you async postback information to your server  in order to retrieve results and normally your form method=post.

If it's the case, you are ok, because google (as far as I know) will not interpret the post method and just stop there and read the page as is.

Now if you use a form method=get (which I doubt), or use kind of querystring to query your db or display default profiles before posting, then google could be able to follow the results and this could lead to duplicate contents. Then you'll need to block these pages with a robot.txt.

Can you post the url you are working on? This will help.

How long ago did you set the redirections?

Depending on the site, it takes more or less time for google to discover your redirections and apply rank.

Also, you might consider using a rel canonical in your pages to enforce the www version.

Finally, you may use google webmaster tool to indicate that you only want the www version.