Question

.With the arrival of the Europeans,there were many battles o

Answer 1

With the arrival of the Europeans 方式状语

there were many battles over land,and the Native American population became much smaller 主干句子（并列句and连接）前面一句是there be结构,后面一句是主系表结构

partly （程度方式状语）because they died from European diseases 原因状语从句