Answer:
A. He or she presides over the senate, and serves as a tiebreaker
Explanation:
The proviso would limit the spread of slavery
16.)Abraham Lincoln 1861-1865
17.)Andrew Johnson 1865-1869
18.)Ulysses s. grant 1869-1877
19.)Rutherford B. Hayes 1877-1881
20.)James A. Garfield 1881
21.)Chester Arthur 1881-1885
22.)Grover Cleveland 1885-1889
23.)Benjamin Harrison 1889-1893
It was the search for such a route to Asia that actually led to the discovery of the Americas by Columbus, which meant that this ushered in an entirely new era of importing goods from the Americas to Europe and exploiting natives in both the Americas and Africa.
The first major public power plant in Europe was constructed in Great Britain.
