This is the statement of the "contact hypothesis"
> https://en.wikipedia.org/w/index.php?title=Contact_hypothesi...
Be aware that there is also evidence for the negative contact hypothesis:
> https://en.wikipedia.org/w/index.php?title=Contact_hypothesi...
"Stefania Paolini, Jake Harwood, and Mark Rubin (2010) proposed that intergroup contact may have more negative than positive effects on prejudice, because it makes outgroup members' social group more salient during encounters. [...] Negative sentiments triggered by proximity are also described as NIMBYism (Not In My Back Yard)."
In other words: it can also happen that if you get to know some people from other countries more, you begin to hate them more.