The most multinational state in Europe in the nineteenth century, and thus the one most threatened by the new ideology of nationalism, was:

Austria

Explanation:

The most multinational state in Europe in the nineteenth century, and thus the one most threatened by the new ideology of nationalism, was Austria.

The inhabitants which included Germans, Czechs and Hungarians wanted equality between the three tribes . This caused a lot of tension as the language spoken was German while the Hungarians named the villages and cities in their language. An agreement was later reached to prevent war happening.

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.

rosevelt. 1973. "slaves everywhere"