How many states were admitted to the union by 1900

45 States

Explanation:

The first states to ratify the U.S. Constitution were Delaware, Pennsylvania and New Jersey, in December 1787, and they were joined by the remainder of the thirteen ex-British colonies by 1790. Another three states joined before the turn of the nineteenth century, and there were 45 states by 1900.

i think it would be reparing roads  

your answer would be just capitalism.