People who supported nineteenth-century social, economic, and political reform movements in Texas and throughout the United States are best known as —

Progressives.

Explanation:

In the United States of America, the period between the 1890s and the 1920s was generally referred to as the Progressive Era; it involved an intense widespread focus on family and education, political reform, modernization, business expansion, prohibition and social activism aimed at eradicating corruption, wastage and social ills within the society.

The Eighteenth (18th) and Nineteenth (19th) Amendments were typically as a result of the Progressive Era; the former abolished the manufacturing, sales and transportation of alcohol while the latter enfranchised the right to vote for women and forbade gender-based suffrage restrictions.

During the Progressive Era, amendment concerning the income tax, worker's compensation, direct election of senators, improved child labor laws, prohibition, minimum wage legislation and women's suffrage were enacted.

Hence, the progressives were the group of people who supported nineteenth-century social, economic, and political reform movements in Texas and by extension the United States of America.

Additionally, some of the key political figures that championed the Progressive Era were Theodore Roosevelt, Woodrow Wilson, Al Smith, Robert M. La Follette Sr., Herbert Hoover, William Jennings Bryan, and Charles Evans Hughes.

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explanation:

may i ask what challenges?