I believe the answer is inflation.
Inflation- rising prices due to an increase in the supply of money
Answer:
items that went from Europe to the new world
grains- wheat,rice barley,oats
livestock-cattle,sheep,pigs,horses
food- turnips,peaches,pears,olives,onions
items that went from new world to europe
Foods-avocados,peanuts,tomatoes
animals-llamas,alpaca, turkey no other above 100 pounds
Peppers, sweet potato,tobacco
I know Ellis Island is a major immigration station in New York... Is there a specific time period though?
The main difference between being poor in America and Europe in the 19th century etc. was that America offered much more opportunities due to the fact that it was a nation that was being built up from the ground. This meant that poor people and people of low education could at least get various jobs in construction and related things whereas in Europe, the opportunities for such people were much smaller.