Which of these two demonstrate president nixon's expertise in foreign relations matters?
nixon doctrine
visit to china
the new federalism
safeguard program

visit to China

Explanation:

Richard Milhous Nixon was the thirty-seventh president of the United States between 1969 and 1974, the year in which he became the only president to resign. Previously, Nixon had been the 36th vice president of the United States from 1953 to 1961 and previously as a member of the United States House of Representatives (for the 12th district of California) and the United States Senate (for California).

Nixon ended the intervention of the United States in the Vietnam War in 1973 and brought back home prisoners of war (POW) - He suspended military service. He visited the People's Republic of China in 1972 for the eventual start of diplomatic relations between the two nations and the initiation of the detention of the Anti-Ballistic Missiles with the signing of a treaty with the Soviet Union that same year.

a. the astrolabe could determine the correct latitudinal location of the ship

yes.

explanation:

because it let the japanese know who had the upper hand in the war.