Name The Year: 9th modern Olympic games opens in Amsterdam.?

Questions

In 1883 U.S. and ---------- begin the use of standard time zones (standard time zones established by the railroads in both countries). ?

In 1889 Oahu Railway begins public service in---------- . ?

In 1903 Hay-Bunau-Varilla Treaty, gives US exclusive canal rights through---------- . ?

In 1909 U.S. invades---------- , later overthrows President Zelaya. ?

In 1918 Latvia declares independence from---------- . ?