Which was the last group to be granted the right to vote

The last group of people who were granted the right to vote were women.

Hope this helps, and sorry if im wrong

1776 - only landowners were allowed to vote

1856 - only white men were allowed to vote

1920 - women were granted the right to vote

1947 - Native Americans given the right to vote

I assume non-Native Americans and non-American born citizens (but were later assimilated) were allowed to vote later on.

So technically Native Americans were the last group to be granted the right to vote, unless you're counting non-natives as well.

the use of email to replace slower surface mail.

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.