Formerly, Google did not manage that nicely or really at all – they’d only see the U.S.-English version of the web page.

Google is going to be able let it establish language settings, along with to manage such content by sending GoogleBot from distinct IPs around the planet. Here are the two approaches:

Geo-spread crawling where Google bot would begin to use IP addresses that seem to be coming from outside the USA, along with the current IP addresses that seem to be from the united states that Google bot now uses.
Google firmly urges you use TLDs or distinct URLs based on having content unique for languages or different states.

Our recommendation to use different URLs with rel alternative hreflang annotations for every locale is not altered by these brand new settings. We continue to support and advocate using different URLs as they’re still the easiest way for users to socialize and share your content, as well as to optimize better position of all versions of your content and indexing.
If you’re utilizing the rel alternative hreflang annotations with URLs that are different, keep doing this.

This new support is intended to solve a problem Google is having with comprehending websites that deploy locale-adaptive techniques.