How did the 1854 Treaty of Kanagawa affect Japan? It ended a war between the US and Japan. It settled a dispute over land rights. It began trade between the US and Japan. It marked the end of the Tokugawa shogunate.How did the 1854 Treaty of Kanagawa affect Japan? It ended a war between the US and Japan. It settled a dispute over land rights. It began trade between the US and Japan. It marked the end of the Tokugawa shogunate.