Crucial Foreign Policy Decisions

Each of these foreign policy decisions not only shaped the respective country's history but also had broader implications for international relations.

1. Australia's 1951 ANZUS Treaty: Established a crucial security alliance with New Zealand and the U.S., reinforcing regional stability.

2. Japan's 1956 Diplomatic Shift: The normalization of relations with the Soviet Union post-World War II opened new diplomatic avenues.

3. Europe's 1991 Maastricht Treaty: This treaty not only created the European Union but also significantly transformed European politics and economics.

4. The United States Marshall Plan: A historic initiative aiding European recovery post-World War II, fostering global economic stability.

5. China's "One Country, Two Systems" Policy: Post-1997, this policy significantly impacted Hong Kong's governance and relations with the mainland.

6. India's 1972 Simla Agreement: Aimed at fostering peaceful relations with Pakistan, highlighting diplomacy in a complex region.

7. Brazil's Mercosul: Established in 1991, it underscores regional economic cooperation and integration.

8. South Africa's End of Apartheid: The 1994 transition marked a significant shift towards democracy.

9. Canada's 1982 Constitution Patriation: A step towards complete sovereignty and national autonomy.

10. Russia's 1991 Dissolution of the Soviet Union: Altered global dynamics, marking the end of a significant era in international relations.

11. Mexico's Participation in NAFTA: Opened economic corridors and redefined regional trade.

12. Egypt's 1979 Peace Treaty with Israel: A major diplomatic shift in Middle Eastern politics.

13. Saudi Arabia's Vision 2030: Launched in 2015, aiming to diversify the nation's economy and reduce oil dependency.

These are some recommended texts:

1. "Australia, New Zealand, and the United States" by Richard W. Baker.

2. "Japanese-Soviet Relations Since 1945" by Kimura Hiroshi.

3. "The Maastricht Treaty" by Finn Laursen.

4. "The Marshall Plan: Dawn of the Cold War" by Benn Steil.

5. "Hong Kong's Reunion with China" by Gerard A. Postiglione and James T.H. Tang.

6. "Shimla Agreement 1972: Its Wasted Promise" by G Parthasarathy.

7. "The Origins of Mercosur" by Gian Luca Gardini.

8. "Long Walk to Freedom" by Nelson Mandela.

9. "The Patriation of the Constitution" by Gérard La Forest.

10. "The Collapse of the Soviet Union, 1985-1991" by David R. Marples.

11. "Opening Mexico" by Julia Preston and Samuel Dillon.

12. "The Road to Peace" by Boutros Boutros-Ghali.

13. "Saudi Arabia in Transition" edited by Bernard Haykel, Thomas Hegghammer, and Stéphane Lacroix.