The idea popular in the united states during the 1800's that the country must expand its boundaries to the pacific

one of the main reasons was definitely slavery. back in 1861, republican abraham lincoln was elected and ended up being a major influence in the slavery business. slavery greatly affected the texas economy because back in 1845 during the annexation of texas, slaves became a big part of the texas population. many texans that were in favor of the secession influenced groups through party ties.

the ottoman empire was dwindling and two large to manage

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