and among Americans themselves .and后面是和哪词语并列?

and among Americans themselves .and后面是和哪词语并列?
It didn't come easily.America’s early history is marked by conflict with other countries threatened by republican government and among Americans themselves over the ultimate form that that government would take.
“ and among Americans themselves over the ultimate form that that government would take.”这个是和哪个词并列?

美国早先的历史不仅是一部美国与共和政体统治下的多国抗战的历史,还是美国国内为最终统治形式争论不休的历史.也就是说存在两种conflict,分别是conflict with other countries threatened by republican government以及（and）conflict among Americans themselves over the ultimate form that government would take.也就是说它是和 with other countries threatened by republican government这个介宾短语并列的.