Final answer:
The three groups impacted by the poll taxes in Texas were African Americans, poor farmers, and Populists.
Step-by-step explanation:
The three groups in Texas impacted by the poll taxes were African Americans, poor farmers, and Populists.
African Americans: Poll taxes disproportionately impacted African Americans as they were usually quite poor and unable to afford the tax. This meant that they were less likely to be able to vote.
Poor farmers: The poll tax reduced the ability of poor farmers to vote since they would have to pay a fee to register. This created a barrier for them to exercise their right to vote.
Populists: The adoption of the poll tax in 1902 in Texas limited the effectiveness of black voters and also impacted poor farmers. As a result, Populists, who were one of the leading groups in Texas, were affected by the poll tax legislation.