Roundheads were Parliamentary/Puritan soldiers who wore tight fitting un-orimented metal helmets, while Cavaliers were kings men who wore large hats with feathers as their uniform headdress.
Some differences between the round-heads and the cavaliers are that the cavaliers supported the King and the round-heads supported Parliament.
You didn’t add any options here but I’ll define feudalism for you. Feudalism is a military hierarchy where the ruler offers troops land in exchange for military service. The individual who accepts this offer is called a vassal. The ruler who offered the land is known as the vassal’s lord.
They became a democracy in the 50th centery
