The answer is A to keep out barbarians. they didn't want the mongolians invaiding them
Answer:
Without the movement of goods, people, and ideas, cities falter, economies wane, and societies wither. As local economies and their associated land uses have become more specialized, mobility has grown ever more central to the sustainability of human activity. Economic specialization, which has fueled productivity growth and propelled the dispersion of interlinked activities worldwide, is premised upon various forms of mobility, including the migration of labor from low-wage to high-wage places, the daily travel of workers from their homes to workplaces, the movement of materials to worksites, and the distribution of finished products to markets. When mobility ceases, as in the case of a natural disaster, not only do workplaces fall idle, but also people cannot get emergency medical attention, families cannot obtain food, and social gatherings of all sorts are canceled or postponed.
The increasing importance of mobility to local, regional, and global economies and to everyday life is reflected in data showing the relentless increase in many measures of the movement of people and goods
Explanation:
In return for the barons pledging loyalty to King John, the Magna Carta limited the king's power, with most of the document detailing the rights of the barons under the feudal system. However, it also described the rule of law , including the important point that the king was subject to the law, like all other people. hope i helped i got it off safari
Henry Ford founded the Ford Motor Corporation in 1903 and introduced a novel manufacturing process that was called ASSEMBLY LINE, it was faster and less expensive than other processes. This process divided the production into several step-by-step processes, each part moved from workstation to workstation every moment until all parts were together.
This manufacturing process also revolutionized manufacturing outside the automobile industry. This was later called FORDISM, that allowed manufacturers to expand their operation, hire more people to work, raise salaries and lower the price of goods. In the end, this fuelled the US economy, improved productivity, raised standards of living with higher-paying jobs.