Explain how the influence and reach of the newly reformed ku klux klan differed from its 1866 iteration; why were these racist ideas experiencing a resurgence throughout the 1920's.

First Ku Klux Klan movement  began in Tennessee, as a social club that brought together soldiers who had fought for the southern states, in the American Civil War (Confederate veterans). They didn't want black political establishment, and practiced assassinations and threats of violence to succeed it.

In the 1920's, was a resurgence of this movement. Not only opposed to black people, but to jews, catholics, and newly arriving immigrants such as Italians. It wasn't only nationalist but it practiced xenophobia.

The Ku KLUX KLAN was founded in 1866 by a group of radical veterans of the confederation, the founders created this sect because at this time black men began to have political power,

The Ku Kux Klan began to carry out violence against African-American voters and leaders, where more than 10 leaders were killed by the sect.

At the beginning of the years 1915 the sect resurfaced in Georgia, with racist ideas against black men, Roman Catholics, Jews and foreigners.

These racist ideas resurfaced due to the increase of immigration that America experienced at the beginning of the 20th century, having a maximum of 4 million members in 1920.  

explanation:

there are two statements that are incorrect.

1. the marshall plan was a lend lease program. it was an economic plan that europe redevelop itself after wwii.

2. einstein didn't really do anything to further the allied cause in building the bomb. he merely sent a letter to fdr telling him (in 1939) that if the united states entered the war, perhaps it would be wise to build the bomb before germany did. i would say this answer is incorrect, but when america entered the war 2 years later, fdr thought it might be a good idea to take einstein's advice.

the 4th choice is definitely so wrong that is likely the single answer of this question