Final answer:
The United States gained self-governance, economic independence, and the ability to form a unique national identity free from British control, which facilitated its growth into a global power.
Step-by-step explanation:
The benefits gained from not being under Britain's rule after the American Revolution are numerous and diverse. One of the primary benefits was the ability to self-govern, which allowed the United States to establish a government that is representative of its citizens' needs and desires. This self-governance enabled the burgeoning nation to make decisions that were in its own best interests, rather than being subjected to the interests of the British crown. Moreover, Americans could expand westward and exercise their belief in Manifest Destiny without British restrictions, thereby creating more opportunities for growth and settlement.
Another significant benefit was economic independence. Without the heavy taxes imposed by the British Empire, Americans were free to trade with other nations, fostering economic growth and industrial development. Additionally, the concept of American identity and nationalism flourished, unshackled by British cultural dominance, allowing a unique American culture to develop.
Last but not least, the United States could build its own military forces without British control, which has contributed substantially to its rise as a global power. The Revolutionary War, in essence, enabled Americans to create a country based on their own ideals of freedom and democracy, rather than continuing to live under British colonial policies which many felt constrained by.