Explanation:
J.J. Thomson's show the experiment with cathode ray tubes showed that all atoms contain tiny negatively charged particles called electron.
Answer:
The Truman Doctrine was an American foreign policy whose stated purpose was to contain Soviet geopolitical expansion during the Cold War.
Explanation:
With the Truman Doctrine, President Harry S. Truman established that the United States would provide political, military and economic assistance to all democratic nations under threat from external or internal authoritarian forces.
