When you are adding/colonizing a new piece of land to a already established country, it is called annexing.
You can annex via peaceful diplomatic negotiations, or full out war.
Most commonly however annexing is done by warfare. An example of this is World War Two when the Nazi's took over large amounts of Europe.
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In the context of the Cold War, yet generally true for any context, the take-over of Another Country (or region belonging to Another Country) is usually called a 'conquest.' Where it is accomplished without fighting, one may refer to it as an 'annexation' or, in certain circumstances, a 'usurpation.' If the land in question is not formally claimed or organized, its take-over may be variously put as a 'claiming,' a 'discovery,' or 'occupation,' among other terms available.
well its to be said that it was kenya
"the Separate Customs Territory of Taiwan, Penghu, Kinmen, and Matsu (Chinese Taipei)"
Six countries that gained territory after World War 1 include France, which acquired Alsace-Lorraine from Germany; Italy, which gained territory from Austria-Hungary; Romania, which expanded its borders and gained territory from Austria-Hungary; Greece, which acquired Western Thrace from the Ottoman Empire; Poland, which gained independence and expanded its borders; and Czechoslovakia, which emerged as a new country and gained territory from Austria-Hungary.
It was diffulct