Question

in 1972, nixon became the first us president to
initiate a \cold war\ with communist nations.
visit china while still in office.
withdraw official us recognition of china.
officially recognize the soviet union.

Explanation:

Nixon's 1972 official visit to China was a historic first for a sitting US president, normalizing bilateral relations. The US initiated the Cold War earlier, never withdrew recognition of China, and recognized the Soviet Union decades before 1972.

Answer:

visit China while still in office.