How did congress contribute to the extension of equal rights to marginalized groups in the 20th century

Congress helped to pass several different laws that helped marginalize groups during the 20th century including:

1) The 19th amendment- The 19th amendment, passed in 1920, helped women gain the right to vote. This significantly helped women in American society, as it gave them a voice in the political process along with the ability to vote for individuals who would serve in their best interests.

2) The 24th amendment- This amendment outlawed the use of poll taxes as a means to stop people from voting. During the late 19th and early 20th century, poll taxes were used as a way to stop African-American men from voting in local, state, and national elections. Making this illegal allowed more African-American men to vote in elections.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain

no because we were not ready for war