Answer:
the west is hotter and less moist due to the wind patterns that prevent the pacific from blowing water into the land.
Explanation:
Trees need more moisture to maintain their height and health so due to the dryness of this part of the US it is extremely hard to grow some types of trees here.
In the western United States, the temperate prairies mainly support the grassland, not the forest.
The Western United States has very low precipitation or rainfall hence it is dry and hot. These planes are most of the are a barren desert that inhibits the tree seeds to grow and survive here.
The air mass of the western USA is continental tropical (cT) that is hot and dry this also prevents the large tree to survive.
Therefore, In the western United States, the temperate prairies mainly support the grassland, not the forest.
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