Can someone explain mcculloch vs maryland to me? i read the article about it over and over but i just don't seem to fully understand it.

Beginning in the eighth century B.C., Ancient Rome grew from a small town on central Italy’s Tiber River into an empire that at its peak encompassed most of continental Europe, Britain, much of western Asia, northern Africa and the Mediterranean islands. Among the many legacies of Roman dominance are the widespread use of the Romance languages (Italian, French, Spanish, Portuguese and Romanian) derived from Latin, the modern Western alphabet and calendar and the emergence of Christianity as a major world religion. After 450 years as a republic, Rome became an empire in the wake of Julius Caesar’s rise and fall in the first century B.C. The long and triumphant reign of its first emperor, Augustus, began a golden age of peace and prosperity; by contrast, the Roman Empire’s decline and fall by the fifth century A.D. was one of the most dramatic implosions in the history of human civilization.

pepin the short[a] (german: pippin der kurze, french: pépin le bref, c. 714 – 24 september 768) was the king of the franks from 751 until his death. he was the first of the carolingians to become king.[b][2]

the younger son of the frankish prince charles martel and his wife rotrude, pepin's upbringing was distinguished by the ecclesiastical education he had received from the monks of st. denis. succeeding his father as the mayor of the palace in 741, pepin reigned over francia jointly with his elder brother carloman. pepin ruled in neustria, burgundy, and provence, while his brother carloman established himself in austrasia, alemannia and thuringia. the brothers were active in suppressing revolts led by the bavarians, aquitanians, saxons, and the alemanni in the early years of their reign. in 743, they ended the frankish interregnum by choosing childeric iii, who was to be the last merovingian monarch, as figurehead king of the franks.