Why did Isaiah Montgomery vote with the majority in the Mississippi Convention

He participated in the 1890 Mississippi constitutional convention as a delegate from Bolivar County and voted for the adoption of a state constitution that effectively disfranchised black voters for decades, using poll taxes and literacy tests to raise barriers to voter registration

In many ways, the U.S. and Texas Constitutions are similar documents. They both embody the principles of representative democratic government, in which sovereignty emanates from the people. Both contain a bill of rights that protects civil liberties from government infringement… both provide for a bicameral legislature with a House of Representatives and a Senate… both seek a system of checks and balances and separation of powers between legislative, executive, and judicial branches of government… and both divide government power between upper and lower levels of government. In the U.S. Constitution the states are subordinate to the federal government, and in the Texas Constitution the counties are subordinate to the state government.