Answer:
Step-by-step explanation:
They weren't modern. They lacked weapons and couldn't stand much chance against the more developed and powerful Europeans.
The Indians lived in separate tribes. Because of this, when Europeans attacked them, the Indians had a hard time unifying with the other tribes to create a united front.
They were weakened by the new diseases sent over by the Europeans.
The main disease that ravaged the population of Native Americans was smallpox. Smallpox was a deadly disease that decimated the Native population in some places over 90%.