Abolitionists often opposed annexation of western territories because they:

abolitionists often opposed annexation of western territories because they: Feared the extension of slavery.

Explanation:

Abolitionism was termed as the movement which was taken to end slavery. Groups in eastern Europe organized on how to abolish enslavement for Romans in Moldavia and Wallachia.

Mauritania was termed as the last country which abolished legal slavery.

Abolitionist were termed as the minority of Americans who proposed emancipation of slaves and also to have equal rights from Americans to Africans.

They believed that slavery was a sin. The first abolitionist was William Lloyd Garrison.

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as general terms,  indian territory,  the indian territories, or  indian country  describe an evolving land area set aside by the  united states government  for the relocation of  native americans  who held  aboriginal title  to their land. in general, the tribes ceded land they occupied in exchange for  land grants  in 1803. the concept of an indian territory was an outcome of the 18th- and 19th-century policy of  indian removal. after the  civil war(1861–1865), the policy of the government was one of  assimilation.