How did the constitution overcome the weaknesses of the articles of confederation?

The constitution was more powerful than the Articles, and it gave the government some rights that it needed to govern the country, that the Articles didn't read, such as rising taxes.
Also, the new government had more power- power was centralized in the federal government at the cost of state authorities.

In 911, a group of vikings lead by rollo besieged paris and chartres. after a victory near chartres on 26 august, charles decided to negotiate with rollo. the talks were led by hervé, the archbishop of reims. this resulted in the treaty of saint-clair-sur-epte, which granted rollo and his soldiers all the land between the river epte and the sea. it also granted him brittany, "for his livelihood". at the time, brittany was an independent land which france had not been able to conquer. in exchange, rollo promised the king his loyalty and military assistance when needed. also rollo also agreed to be baptised and to marry gisela, the king's daughter. the territory given rollo is about the same as upper normandy.