They named themselves the middle kingdom because they saw themselves as the center of the world.
The columbian exchange is quite important. This "event" was named after Christopher Columbus and this was used to transfer plants, animals, some culture products or what people used, technology, and pretty much the very basic yet important key things that many people needed. These were all exchanged from America to West Africa, and I believe the Old world. I can't really get the times. But this is the basic information needed.
Have a nice day.
Isolationism is independence from the needs of other countries, people, groups, etc.
<span>La cebolla fue uno de los ingredientes populares
para los granjeros. Esto obedece a que en 1919, <span>cuando la epidemia de
influenza mató a 40 millones de personas en el mundo, era muy común en las granjas,
colocar cebollas sin pelar en las diferentes habitaciones de la casa, con lo
cual el virus de la influenza se adhería a la cebolla, brindando de esta forma protección
a los miembros de la familia. La cebolla tiene poderosas propiedades
bactericidas y antisépticas y esto ha sido parte de la sabiduría popular.</span></span>
