The is no policy that can prevent a war. If one nation wants to fight someone, there will almost always be a way (reason or excuse) to start one. Just like people, if someone wants to start trouble...they can...regardless of rules (or laws).
The only policy during the cold war was the US Government's "First Strike" doctrine. The US Military reserved the right to retaliate with chemical warfare weapons if the enemy used them first; the US military would not deploy bio weapons; but US doctrine called for FIRST STRIKE capabilities with nukes.
Translation: If there was going to be a nuclear war; the US was going to be the first to use atomic weapons. (To use an old western frontier adage, "to get the drop on the bad guy").
One way that the United States secured its trading powers with China was to initiate the Open Door Policy in 1899 and 1900.
European powers divided China into spheres of influence, while the United States promoted an Open Door Policy.
This entirely depends on what policies we are talking about, be they educational policy, military policy, foreign policy, trade policy, etc.As concerns foreign policy, US foreign policy in its first few decades was NEUTRALITY, meaning that the US would stay out of long-term alliances, treaties, engagements, and wars with the major European powers.
Congressional powers not expressed are implied powers.
The principle is called "Checks and Balances".
The US Constitution divides the foreign policy powers between the President and Congress so both share in foreign policy.
What started out as a civil war escalated into a spinoff of the Cold War as North Korea (China) and South Korea( The US ) were supported by these external powers.
It was somewhat of a civil war between North and South Korea, stemming from attempts to reunite the two halves into one Korea. Because both sides were supported by different world powers, the conflict escalated into war.
setting foreign policy
Quadruple AllianceIt disassembled the Napoleonic Emprie that had uprooted the stability of Europe and clarfied the relationship between the European powers such as France, Britain and Austria and the old terrotories of the Napolionic Empire such as Italy
The implied powers of the president in foreign policy making is the draft. Abraham Lincoln implemented the draft during the civil war.
setting foreign policy
open door policy
unimportant
unimportant
The United States Constitution divides foreign policy powers, there are six basic ways in which Congress can originate or shape foreign policy
The use of taxing and spending powers to shape the economy is commonly called fiscal policy. This type of policy influences macroeconomic conditions.