When Spain first started to claim North America they set up forts which were called <span>presidios to protect their lands</span>
<span>The area
west of the Ural Mountains is warmer compared to other areas because of the
mountain ridges that shield the place from the very cold winds. It has also a
leveled area with enough water supplies from the lakes and rivers. In addition,
the place is rich in mineral and natural resources; thus, life and industry
will thrive amply there.</span>
Silk Road in Western Han Dynasty (206 BC–24 AD) From 139 BC to 129 BC, Zhang Qian set out on his journey to the Western Regions twice, pioneering the world-famous route.
I believe the answer is A !
