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I created a blog with all post in english and spanish, but google indexed it as spanish page. I'm investigating the cause.

Does google see the language that I use in google webmaster tools page when I sent my sitemap?

Does google see the country of owner of the domain in whois? In the whois of the domain the country is spain.
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Does google see the language that I use in google webmaster tools page when I sent my sitemap?

No google dont differentiate languages in sitemap.

Does google see the country of owner of the domain in whois? In the whois of the domain the country is spain.

Google dont use whois information.

This could just be coincidence check whether the links to your english URLs pages are proper