In which scandal was lt colonel oliver north implicated

Lt. Colonel Oliver North was implicated in the Iran-Contra Affair.

Explanation:

North was a member of the National Security Council in the 1980s and was noted for his involvement in the Iran-Contra Affair. The scandal involved clandestine aid in the form of arms sales to the Islamic Republic of Iran to try to secure the release of American hostages in Lebanon. Oliver North also formulated a second part of the plan, which involved the sale of arms in support of the Conservative rebels in Nicaragua (in violation of the so-called "Boland Amendment," a bill passed in Congress that prevented the US government from intervening in any way in that country).

true

coz they had the rank system in society according to the economic power of the people

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.