What was the Articles of Confederation, and why was the Articles of Confederation replaced with the United States Constitution?

In 3-6 sentences describe the strategy between generals' grant and lee's armies at wilderness and spotslvania . why are they significant? i will mark brainliest! answer only if u truly know the correct answer

Why was the united nations established

Two gymnastics teams are intense rivals. the first team has started recruiting new gymnasts from different cities and even foreign countires in an effort to build a stronger team. after learning this, the secondteam begins its own recruitment campaign to find better gymnasts. over a period of months, each team recruits dozens of players, each time trying to find a better recruit than its rivals most recent addition. which idea from the cold war is most similar to this scenario