Today Zhang Qian's travels are associated with the major route of transcontinental trade, the Silk Road<span>. In essence, his missions opened up to China the many kingdoms and products of a part of the world then unknown to the Chinese. Zhang Qian's accounts of his explorations of Central Asia are detailed in the Early Han historical chronicles, </span>Records of the Grand Historian<span>, compiled by </span>Sima Qian<span> in the 1st century BC. The </span>Central Asian<span> sections of the Silk Road routes were expanded around 114 BC largely through the missions and explorations of Zhang Qian.</span>[2]<span> Today Zhang Qian is considered a national hero and revered for the key role he played in opening China to the world of commercial trade.</span>
Answer:
The four categories for air masses: arctic, tropical, polar and equatorial. Maritime air masses form over water and are humid. Continental air masses form over land and are dry
Overall, in the United States, "<span>D: Many urban populations were comprised of immigrants," since it was the immigrants who mainly worked in the factories, which were located in or around cities. </span>
D. there was no official change in territory or policies