system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the West Coast of NA have coniferous forests and East Coast have deciduous forests?
gpt
We actually have conifer forests in the eastern part of the US, some communities such as spruce/fir  forests are climax type. Most of the East Coast would be considered second growth, with a lot of maples and oaks coming back after intensive agriculture in the 18th and 19th centuries.