What is a preamble, what does it do, how did it come about, why did it come about, please go into detail

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.

answer: andrew johnson

17th u.s. president

in what way were president abraham lincoln's and president andrew johnson's reconstruction plans similar? a)both reserved seats in the congress for former confederate war leaders. b)both granted voting rights to the newly freed slaves. d) both required southerners to support the thirteenth amendment to abolish

explanation:

may i have the answer choices?