Misc: What continent is part of both the east and west hemispheres?

Questions

In 1917 US declares war on ---------- (WWI).?

In 1926 ---------- planes take off on first successful around-the-world flight.?

In 1965 Intelsat 1 ("Early Bird") first commercial ---------- communication satellite.?

In 1973 Pioneer 11 launched. First spacecraft to flyby?

In 1975 Nationalist Chinese leader Chiang ---------- died at the age of 87.?