Final answer:
Herbert Hoover was the president who signed the Smoot-Hawley Tariff and was in office when Japan invaded Manchuria, which contributed to international economic and political tensions.
Step-by-step explanation:
The president that dealt with the foreign issues of the Smoot-Hawley Tariff and Japan's invasion of Manchuria was Herbert Hoover. President Hoover signed the Smoot-Hawley Tariff into law in 1930 in an effort to protect American industries during the early stages of the Great Depression.
However, this protective measure led to retaliation from foreign trade partners and worsened the global economic situation.
Additionally, during Hoover's presidency, Japan invaded Manchuria in 1931, which marked a significant step towards the creation of a Pacific empire and raised tensions in international relations, particularly under the constraints of the Open Door policy.