The following diagram shows two budget lines: A and B. 
Which of the following could explain the change in the budget line from A to B?
Definitions:
Lincoln's Demands
Refers to the conditions set forth by President Abraham Lincoln during the American Civil War, including the preservation of the Union and the abolition of slavery.
Lee Surrender
The event on April 9, 1865, when Confederate General Robert E. Lee surrendered his army to Union General Ulysses S. Grant, effectively ending the American Civil War.
Self-Government
The right or ability of a community or nation to govern itself without external control, making its own laws and policies.
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