(CONTINUED)
1965 United States begins large- scale intervention in Vietnam.1967Israel defeats Egypt, Syria, and Jordan in the Six- Day War.
Glassboro summit signals détente, loosening of tensions
between the superpowers.1968 Czech government liberalization halted by Soviet invasion. Nuclear Nonproliferation Treaty (NPT) signed.1972U.S. President Nixon visits China and Soviet Union. United
States and Soviet Union sign strategic arms limitation treaty
(SALT I).1973 Yom Kippur War between Israel and Arab states leads to global energy crisis.1975Proxy and anticolonial wars fought in Angola, Mozambique,
Ethiopia, and Somalia. South Vietnam falls to communist North
Vietnam.1979United States and Soviet Union sign SALT II (but U.S. Senate
fails to ratify it). Soviet Union invades Af ghan i stan. Shah of Iran
(a major U.S. ally) overthrown in Islamic revolution. Israel and
Egypt sign a peace treaty.1981–89 Reagan Doctrine provides basis for U.S. support of “anticommunist” forces in Nicaragua and Af ghan i stan.1985 Gorbachev starts economic and poUnion.^ liti^ cal reforms in Soviet1989Peaceful revolutions in Eastern Eu rope replace communist
governments. Berlin Wall is dismantled. Soviet Union withdraws
from Af ghan i stan.1990 Germany reunified.1991 Resignation of Gorbachev. Soviet Union collapses.1992–93 Russtates.sia and o^ ther former Soviet republics become in^ de^ pen^ dent50 CHAPTER TWo ■ HIsTOrICal CONTExT Of INTErNaTIONal rElaTIONsESSIR7_CH02_020_069_11P.indd 50 6/14/16 10:02 AM