The indentured servants and people from prisons were coming to the colonies around the 1700's and were from the debtor's prisons in England. the British defeated the Irish in the Early 1600's , They then sent Scot's to Northern Ireland.Most of the slavers in the colonies were Scots whom we often mistake for Irish. Those slaveholders were mostly Protestants,therefore Scots or Scot-Irish. They Irish were Catholics and despised by the Brits. The history is clear they were shipped to the New World as Slaves by Cromwell not servants or indentured's.Several slave colonies in the mid to late 1600 passed laws that said Irish can't be slaves. Slaves were worth $1300.00 a piece in various periods. They were wealth creators in simple possession and the free labor they provided.
As to persons trying to deny African heritage that makes no sense ,if an individual was classified as a mulatto in 1650 and his descendants 350 years later are still black,African-American whatever other than white then that indivual clearly had a lot of African genes.
The importance of whites being held in bondage,slavery, from 1600, is that as you well know in the beginning of the Atlantic Slave trade 90 percent or more of the captures were men.Women and children were not sent.Cromwell sent the hated Catholics into slavery without thought of their laboring skills.History is clear that African slaves ,white slaves,white indentures freely comingled and cohabited.At a later date the planters realized they needed females to continue the manpower levels particularly when cotton rose to importance.