After watching the videos above and reading the lyrics of the Battle Hymn of the Republic, EXPLAIN why both Dr.
Martin Luther King, Jr. and Congressman John Lewis
reference it.

The two famous civil rights leaders, Dr. Martin Luther King, Jr. and Congressman John Lewis, recognized that the "Battle Hymn of the Republic" was a praise-filled lyric that inspired the abolition of slavery during America's civil war and energized the unity of the Union North and the Confederate South.

Explanation:

Please, see attached document.

the us constitution is a living document, meaning that it can be changed over time as the country changes.

first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.