Five states or 10% became states after 1900.
Five of them.
States were added in 1890 during the US centennial
Alaska was the 49th state added to the US.
Three states were added, for a total of 16 US states
Alaska and Hawaii were added in 1959.
There are currently 50 states, and the last state added into the US was Hawaii. Hawaii was added on Aug. 21, 1959
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Hawaii and Alaska
Louisiana was added as a state to the United States in 1812.
There were 50 US states in 2008. The last two states added to the US were in 1959: Alaska (49th) and Hawaii (50th).
The amount of "manufacturing" in the United States more than doubled between 1860 and 1900.
The estimated population of the United States in 1900 was 76.2 million people. By the 2010 Census, the population had reached 310 million people.
By 1900, all states and territories in the US required compulsory school attendance. This was a significant reform that aimed to increase literacy rates and ensure that children received a basic education.