How could a samurai regain his honor?

By performing seppuku

Explanation:

Only the fear of dishonor and loyalty to his daimyo motivated the true samurai. If a samurai felt that he had lost his honor or was about to lose it according to the rules

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.

it was the first amendment