Why do scholars think slavery started?

Modern slavery is a multibillion-dollar industry with just the forced labor aspect generating US $150 billion each year. The Global Slavery Index (2018) estimated that roughly 40.3 million individuals are currently caught in modern slavery, with 71% of those being female, and 1 in 4 being children.

Explanation:

More than 70% of the 4.8 million sex exploitation victims are in the Asia and Pacific region. Forced marriage is most prevalent in Africa. But there isn't a single country that isn't tainted by slavery: 1.5 million victims are living in developed countries, with an estimated 13,000 enslaved here in the UK.

b) a state law could be declared illegal if it contradicted the constitution.

explanation:

the conflict of this case originated when james w. mcculloch, a cashier of the baltimore branch of the second bank of the united states that the congress had chartered in 1816, refused to pay a tax imposed by the maryland state.

in the case, the state of maryland appealed that the establishment of a second bank was unconstitutional since the constitution didn't say anything about granting that power to congress. however, the case determined that even if such right wasn't specifically stated in the constitution, it was part of the "implied powers" of the government enunciated in article i, section 8.

the case also eliminated maryland's legislation to impose taxes to a national bank, asserting that even though the states retained the power of taxation, the constitution's laws are supreme and can not be controlled by the states, therefore, if a state law contradicts the constitution, it should be declared illegal.

explanation:

currancy

explanation: