To keep the economy afloat while a vast percentage of northern men were fighting the civil war, the was passed to encourage the hiring of immigrants.

The Act to Encourage Immigration

Explanation:

Due to the decrease in the workforce during the Civil War, President Abraham Lincoln signed the Act to Encourage Immigration on July 4th, 1864. The bill was finally passed on March 2, 1864, and signed into law on July 4th of the same year.

answer; sensory adaptation;

among other factors, composers started writing dynamic markings in their scores because "new instruments allowed for more dynamic ranges and contrast."

dynamics allude to the loudness or softness of music. dynamics offer an approach to demonstrate articulation in sheet music. they to drive the enthusiastic substance of music through volume and force. maybe you could alter both the volume and the shading profundity on your screen at the same time. we can likewise think about the force side of elements as the quality of a note. a few notes are intended to be played delicately and gently, while others are intended to be played all the more firmly.  

some dynamics markings have a letter 'm,' which remains for mezzo, signifying 'medium.' so a mezzo piano unique stamping resembles this (mp) and intends to play medium calm, while a mezzo specialty dynamic resembles this (mf) and intends to play medium loud.