The major factor which would help to shape the future of Texas politics is the interaction of major informal institutions and:
According to the given question, we are asked to show the major factor which would help to shape the future of Texas politics with the interaction of major informal institutions.
As a result of this, we can see that the Texas party system is one of the major factors which would help to shape the future of the Texas politics in collaboration with other major informal institutions.
Therefore, the correct answer is The Texas party system
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