What stops one branch of government from becoming too powerful

In the case of a regular veto, Congress can override the veto by a two-thirds vote of both houses. Both the veto power and Congress' ability to override a veto are examples of the system of checks and balances intended by the Constitution to prevent any one branch from gaining too much power.

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pretty sure they split up because of religious conflicts.

a change of venue is the legal term for moving a trial to a new location. a change of venue request because venue is improper means that the removing defendant believes that the case may not be in that venue because it is improper under procedural rules.