What did hamilton amply were the weaknesses of the present system of government under the articles of confederation

Hamilton implied that the central government under the confederation had comparatively less power than the state governments and this was directly affecting the collection of revenue.  Hamilton wanted the central government to have enough power to pass laws by which the state governments should be regulated. It was also not possible for the national government to raise an army. The Congress could not control or regulate the trades. For passing any law the Congress needed the vote of at least the vote of 9 states among the thirteen present.  

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.

"they had a large area of land that they owned."