So that it could be represented in the US legislature.
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because they wanted them to, gosh
because they did
Anyone who want to and who meet the minimum requirements
To fight for what they believed in.
India and china
Wisconsin wanted to help Abraham Lincoln keep the Union together.
Norway and Switzerland do not want to join the European Union.
Texas did not want to join the union of the United States. In 1845 when Texas joined the union, it was due to mismanaged finances, and the refusal of the people that were settling in Texas (which used to be a part of Mexico) to abolish slavery.
To gain economic benefits
Indeed they did. They have wanted to join in a union for a little over 40 years now.
They did not want to have slavery in the western parts of Virginia, so these western counties broke off to form another state so they could let Virginia join the confederacy and they join the Union