What would the world be like without borders, passports and immigration?

Quite frankly, it would be a mess. Countries with out immigration would not exist. The United States itself was made by immigrants, therefore, the US wouldn't exist. Everyone would have just stayed in either Europe, Africa, or Asia, and then it would be overpopulated.

It would be war for land and it would be run under no government history would repeat itself governments would be fighting for one told and with no compromise no significant currency would be chosen and language barriers would soon seed out and languages would soon be forgotten and foreign the world would be one instead of many and would have the same morals and laws we would have to be ruled as one or governed by one