What was george mclellan known for

George McClellan was a U.S. Army engineer, railroad president and politician who served as a major general during the Civil War. ... In 1862, McClellan's Peninsula Campaign unraveled after the Seven Days Battles, and he also failed to decisively defeat Robert E. Lee's Confederate Army at the Battle of Antietam

Explanation:

answer; (a) he was a u.s senator for 38 years;

in mcculloch v. maryland (1819) the supreme court ruled that congress had implied powers under the necessary and proper clause of article i, section 8 of the constitution to create the second bank of the united states and that the state of maryland lacked the power to tax the bank.

gibbons v. ogden, (1824), was a landmark decision in which the supreme court of the united states held that the power to regulate interstate commerce, granted to congress by the commerce clause of the united states constitution, encompassed the power to regulate navigation.