Final answer:
The United States did not join the Allied forces until 1941 due to its neutrality policy. Chinese laborers were excluded from immigration to the U.S. in 1882. The Triple Entente consisted of Belgium, Britain, and France.
Step-by-step explanation:
The country that did not join the Allied forces until 1941 was d. The United States. The main reasons for this delay included the United States' historical tendency to avoid European affairs as well as its isolationist policies. President Woodrow Wilson had initially declared neutrality in World War I, which was largely supported by the American public. The U.S. maintained a smaller standing army compared to European powers, due to its geographical advantages and a longstanding tradition of keeping out of European conflicts. However, issues such as the sinking of the Lusitania and the Zimmermann Telegram eventually led to the United States joining the war on April 6, 1917.
Immigrant laborers from c. China were completely excluded from the United States as a result of the Chinese Exclusion Act of 1882, which was the first major law implemented to prevent a specific ethnic group from immigrating to the United States.
The Triple Entente was an alliance consisting of b. Belgium, Britain, and France. These countries, along with others, formed the core of what would become the Allies in World War I, standing against the Central Powers which included Germany, Austria-Hungary, and the Ottoman Empire.