District of Columbia v. Cornell was a United States Supreme Court case that addressed the issue of whether a municipality could be held liable for damages caused by a defective sidewalk. The plaintiff, Cornell, had been injured when he tripped and fell on a sidewalk in the District of Columbia. He sued the District for damages, claiming that the sidewalk was in a defective condition and that the District had failed to maintain it. The Supreme Court held that the District of Columbia could be held liable for damages caused by a defective sidewalk. The Court reasoned that the District had a duty to maintain the sidewalks in a safe condition and that it had failed to do so. The Court also noted that the District had a duty to inspect the sidewalks and to take reasonable steps to repair any defects that were discovered. The Court concluded that the District was liable for Cornell's injuries and awarded him damages. This case established that municipalities can be held liable for damages caused by defective sidewalks and that they have a duty to inspect and maintain them in a safe condition.

In District of Columbia v. Cornell, the Supreme Court was asked to decide whether a tax imposed on real estate in Washington D.C., which had been paid by the plaintiff, could be refunded due to an alleged lack of authority for its imposition. The majority opinion held that since no statute expressly authorized such a tax, it was invalid and thus not collectible from citizens; however, Justice Field dissented from this ruling. He argued that while there may have been no express authorization for the tax in question, Congress had given broad powers to local governments within Washington D.C., including taxation power over property owners within their jurisdiction - therefore he believed that the court should defer to these powers rather than striking down laws passed by local government bodies as unconstitutional without clear evidence or precedent indicating otherwise. Furthermore, Justice Field noted that if taxes were declared void whenever they lacked explicit statutory authorization then many other validly-imposed taxes would also be rendered invalid - leading him to conclude that it would be more prudent and justifiable for courts to uphold laws unless they are clearly prohibited by higher authorities like federal statutes or constitutional provisions instead of declaring them void simply because they lack specific legislative approval