Help please !! The decision in the excerpt held which of the following to be unconstitutional?

A. Wilmot proviso
B. The Missouri compromise
C. Ostend Manifesto
D. Marbury v. Madison

Which of harriet martineau’s books is a foundational treatise on sociological data collection?

Which answer best describes an advantage of shipping goods by canal? a) most towns would rather have canals then noisy railroads b) goods could travel very fast downstream in the canal system c) traveling by boat is a much more relaxing way to transport goods. d) heavy loads of goods could travel by boat more easily then if pulled by horses.

Analyze interactions among people and events what political sentiment did president harding’s election reveal? explain