How did President Lincoln resolve the sudden loss of revenue coming into the federal treasury in the years after the South seceded from the Union? (Select all that apply.)

a. The president sold at a profit all of the former federal buildings in the southern states.
b. The president passed the Revenue Act of 1861, which said that all citizens would tax to support the war.
c. The president sold war bonds through the U.S. Treasury, which were purchased by banks and investors.
d. The president ordered that salaries for union soldiers be reduced by half until the end of the war.