Why is evidence important in a scientific explanation

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.

it was displayed because they had a love for war

confederacy: supported slavery, believed states should be able to nullify federal laws, supported low tariffs

union: everything else

i would need the graph to answer the question