Southern states sometimes used a grandfather clause to allow them to

Southern states sometimes used a grandfather clause to hinder African-Americans from voting and let the whites to vote.

Explanation:

The Grandfather clause is defined as "a clause exempting certain pre-existing classes of people or things from the requirements of a piece of legislation"

It enacted for voting purpose on Tuesday, 2nd of August, 1898 as a legal or constitutional mechanism passed by seven Southern states during reconstruction to deny franchise (the right to vote in political elections) to black Americans.

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!

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explanation:

max weber's 3 types of authority. the sociologist and philosopher  max weber  distinguishes  three types of authority—charismatic,  traditional  and legal-rational—each of which corresponds to a brand of  leadership that is operative in contemporary society.