Checks and balances operate throughout the U.S. government, as each branch exercises certain powers that can be checked by the powers given to the other two branches. ... Within the legislative branch, each house of Congress serves as a check on possible abuses of power by the other.
Lincoln's political rise is one of the most interesting stories in American history. When Lincoln first entered into politics at the age of 23, he was seen as being ill-prepared to hold office and, moreover, lacking in charm in education. <span> Over time, his intelligence, good humor, and ability to connect with votes lead him to gain greater political clout. Before 1856, Lincoln's political offices consisted mostly of service in the Illinois General Assembly and one term in Congress. In 1856 he joined the new Republican Party. Two years after that he ran for the U.S. Senate, making a name for himself in debates. By 1860 he became the first Republican candidate to win a presidential election.</span>
Slavery ultimately led to the United States Civil War.
Answer:
I'd say the Great Wall of china
Explanation:
built over 2300 years ago, it's over 20,000 miles long!
The answer would be Senate Majority Leader.