A US Territory or as with Puerto Rico, a US Commonwealth, can apply for statehood into the United States first by a vote of the people in the territory. The US Congress accepts the finalized application. The territory, as one condition for example must have its own constitution.
The rest of the nation felt sorry for them.
Texas Doubled Its Size !
The 50th and final state added to the US was Hawaii in 1959.
Pennsylvania was actually the second state to become part of the United States of America. It became a part of the United States in 1787.
The last 2 states added to the Union were Alaska and Hawaii.
Utah was #45 and Hawaii #50.
Virginia was one of the original 13 states in 1776.
In 1848 it was admitted into the United States Of America.
Pakistan is not a part of the United States.
This requirement was part of the original US Constitution which the states ratified ( agreed to accept) when the United States was created.
and what year they i become a part of the us
Korea has not, nor has it ever been, part of the United States of America, or one of its possessions.