Which is the most common and accurate way to measure public opinion

Nationalism led to major conflicts following world war i, especially when:

Article ii "each state retains its sovereignty, freedom, and independence, and every power, jurisdiction, and right, which is not by this confederation expressly delegated to the united states, in congress assembled."—articles of confederation which of the following principles of american democracy does this quote best represent? social contract natural rights federalism rule of law

What role did oregon play in the 1844 presidential election