The Articles of Confederation proved to be an ineffective governing document, as it gave the central government very little power and authority over the states. Key weaknesses included the inability to raise tax revenue, regulate foreign trade, and enforce laws. Several crises further illustrated these flaws, such as states imposing tariffs on each other, the failure to pay war debts, and the inability to quell Shays' Rebellion. Growing divisions over the Articles led to the formation of political parties favoring either keeping or revising the national governing framework.