A coniferous forest contains evergreen trees that bear cones. Elegant pines grow in this biome, along with spruce, fir, and tamarack. In much of the northern forest, the conifers mingle with deciduous trees, particularly aspen, birch, sugar maple, and basswood.
The United States entered the Vietnam war to prevent the spread of communism. China was already a communist country, and the United States believed that China would spread it to other Asian countries if it did not intervene. Continue Reading.
Â· just now. Report Abuse. We didn't actually go to war with VietNam. But the reason that US troops were there was to stop the spread of communism. The domino theory. If VietNam fell to the communist, than all the countries around it would too, creating a domino effect.