Final answer:
The end of one-party politics in Texas was influenced by the introduction of the poll tax, the restriction of black voters, the Reagan Revolution, and the emergence of social conservatism leading to a shift in party allegiances.
Step-by-step explanation:
Factors that brought an end to one-party politics in Texas include the adoption of the poll tax in 1902, which limited the voting capabilities of poor farmers, and laws established in 1923 that restricted black voters through a primary elections system where only members of a certain party could vote. Over time, shifting political landscapes, such as the Reagan Revolution in the 1980s, further disrupted one-party dominance by enticing Southern Democrats to leave their party and join forces with pro-business Republicans. Additionally, issues like civil rights, economic development, and social conservatism played significant roles in the realignment of Texas's political system. The emergence of the Republican Party as a force in Texas politics eventually broke the hold of Democratic one-party rule, catalyzing a transition toward a more competitive two-party system.