During their first couple of years in the Jamestown colony, the English migrants...

   

• doubled the size of their population.
• produced an agricultural surplus--enough to trade with the Native Americans.
• lived remarkably disease-free.
• suffered from famine and diseases that killed more than half the population. 

ANSWER: During their first couple of years in the Jamestown colony, the English migrants suffered from famine and diseases that killed more than half the population.