Common law refers to two things: first, it is the legislation created or established via court decisions, not via written legislation or statues; second, a common law is the system of delivering judgment on the basis of the doctrine of judicial preference.
Since common law has no place in statute, judges do develop or create a new law based on the general views and opinions of judges if the case is unique or rarest of the rare. Well, judgment based on such opinions are often binding on all judgments to be delivered in future by the lower courts under the same jurisdiction. Major advantages of common law are its fairness, fastness and efficiency.
They probably walked across a land bridge that crossed the Bering Strait. A land bridge may have formed there during the ice ages when ocean levels dropped and exposed land. Most scientists accept the theory of the land bridge to explain how the first people came to the Americas.
Carpetbaggers generally supported measures aimed at democratizing and modernizing the South – civil rights legislation, aid to economic development, the establishment of public school systems.