What is the effect of the supermacy clause in the constitution

The Constitution's Supremacy Clause prohibits state governments from passing laws that conflict with federal laws and also prohibits any entity from enforcing laws that conflict with the Constitution. This protects enumerated powers, which are federal government powers that are specifically set out in the Constitution.

the group i'm selecting: greeks.

a first group of greek immigrants came to the us in the 1850s. the second group came to america starting in the 1890s due to economic opportunities they didn't have back in their home caused by the hardships of ottoman rule. greek immigration was 90% male, many of them expected to work and return to greece after earning enough capital, but ultimately had to remain in the us after the greek genocide.