Strong military or capaitalist econmy
After America was established, were similar to multiple eras with migration. Firstly, there was a language barrier. Many immigrants during that time had no knowledge of speaking English. If the immigrant had no body to rely on, like friends or family, they would be said to handicapped. Of course, many Americans highly disliked immigrants. The Americans didn't like immigrants because they felt like they took their jobs away from them, and did not respect their American traditions.
They were both from Poland and they both fought in US Independence War. Kościuszko was fighting more in norther part of US, he was famous for building forts. Pułaski fought more on south US, he created first American cavalry. They are still national heroes in Poland.
It's b pretty sure before the plague Europe suffered from overpopulation and unsanitary environment that was greatly fixed after most of Spain and Europe was wiped out leading the people left over to fix the problems
