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I'm glad you like anatomy. The key word is CONCENTRATION, since the major vessels that supply blood to the legs converge thru a much smaller area in the pelvis before branching to supply blood to the legs.
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And the even larger vessels that feed them (especially the descending aorta) are in the chest, splitting into two branches to form the femoral arteries.
The largest concentration of major blood vessels is in the chest.
Both the aorta and pulmonary artery (and their corresponding veins to return blood to the heart) are all in the immediate area of the heart in great profusion.