Yes, it is true that many of the serious problems that plagued the government under the Articles of Confederation developed because of the limited power of the central <span>government, since this meant that the central government had no power to tax the states. </span>
Two of the most major consequences of the French and Indian War were that 1) the French had to cede large amounts of territory to the British, and 2) the British started heavily taxing the colonies which helped lead to the American Revolution.
The three rules known for unifying Japan are Oda Nobunaga, Toyotomi Hideyoshi, and Tokugawa Ieyasu.