Final answer:
The statement is true; securing the right to vote for women through a constitutional amendment was the most important accomplishment of the first wave of feminist activists. The suffrage movement faced many obstacles and it wasn’t until the 19th Amendment in 1920 that women achieved the right to vote in the United States.
Step-by-step explanation:
The statement that the most important accomplishment of the first wave of feminist activists was to secure a constitutional amendment guaranteeing women the right to vote is indeed true. Winning suffrage was a major focus of women reformers since the Women's Rights Convention at Seneca Falls in 1848, where equality and the right to vote for women were demanded. They faced many challenges, including the enactment of the 14th and 15th Amendments that granted voting rights to African-American men but not women, causing a split in the suffrage movement.
It wasn't until the 19th Amendment was ratified in 1920 that women were granted the right to vote throughout the United States. Before achieving suffrage, women gained other legal rights, such as greater control over the wages they earned and the ability to sue for those wages, but the securing of the vote through a constitutional amendment was indeed a pivotal and defining accomplishment for the feminist movement.