Which law made it harder for some europeans to immigrate to the united state's and easier for others?

Which of the following best explains why california has more catholics than any other state? california is home to a large population of asian immigrants, and many asians are catholic. california has very little religious diversity. california has a large latin american population, and many latin americans are catholic. the catholic church is based in california.

Round arches allowed the romans to create structures with

What from the columbian exchange had perhaps the biggest impact on the world?