The western part of the United States has a much lower population density for mostly everywhere except California and a few major cities like Portland Oregon or Denver Colorado. However, there is plenty of forests and infrastructure that are flammable as a result. For example, the west did not start getting settled till 1850 and wasn't a frontier until 1890. Over half of the United States' National Parks are also located here in the West along with many U.S. National Forests and State Parks. A lot of the land outside of those major cities is not settled leading to many possibilities of wildfires.
The obvious reason for all of this however is the drought. All of the rain that we had in California last year hasn't happened since. As a result, a lot of the vegetation in the West is more vulnerable to wildfires and when they start, they become very hard to stop.

So why not the East then? The eastern United States with the exception of the Appalachians has a very high population density. There are forests in this part of the country, but thanks to the moisture from the Gulf of Mexico and the Atlantic Ocean, this area does not go into droughts as often. There are not as many National and State Parks because the conservation movement did not start until the West was getting settled in the early 1900s.
The Western United States may experience these wildfires often, but the natural geography and the natural weather phenomenons of the west all have led to why the West is more vulnerable to these than the East.
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