As others have said here, making friends with people from different cultures is surely the same as making friends with anyone - barring any potential language difficulties. You haven't said why you want or need to make friends with people from a different culture so I'll look at it from a couple of different angles.
4. Loyal friends have boundaries. Loyalty is not equivalent to becoming a wet blanket. Abuse and misuse of loyalty for one's gain over another is a clear red flag that your loyalty might be hurtful rather than helpful. A loyal friend might be a friend through any circumstance, but personal responsibility and self-care should always come first.