If the government under the articles was so ineffective, why weren't changes made?

The Articles were created during the Revolution.  Since everyone was hyped up for the war, the American colonists couldn't really rebel since the war was fighting on US land.  However, after the war, the central government realized that the Articles of Confederation would not work.  Therefore, they were discontinued and the American Constitution was written.

Your answer is b , public works

This act gave the federal government the power to relocate any native in the east to territory west of the mississippi river.