Final answer:
The passing of the 18th and 19th amendments had historical significance. The 18th Amendment led to Prohibition and the rise of organized crime, while the 19th Amendment granted women the right to vote.
Step-by-step explanation:
The passing of the 18th and 19th amendments to the U.S. Constitution holds great historical significance. The 18th Amendment, which prohibited the sale, production, and transportation of alcoholic beverages, was a result of the Progressive movement's efforts to address social issues such as alcohol abuse. It led to the era of Prohibition, which had a significant impact on American society and gave rise to organized crime.
The 19th Amendment, on the other hand, granted women the right to vote. This was a major milestone in the women's suffrage movement and marked a significant victory for gender equality. It expanded democracy by allowing women to participate in the political process and have a say in shaping the nation.