The nazi-USSR pact was similar to the tripartite pact of the axis powers by implimenting a system of obligated agreement of sharing of convicted territories.
The first reason is that in China, labor costs are much lower, which means that the average wage for any worker is much lower than in the United States. This attracts television manufacturers because they can reduce labor costs, meaning that they can also lower the price of the goods.
The Middle East has been an important source of musical instruments for other parts of the world. Bagpipes, guitar, lute, oboe, tambourine, viols, and most zithers have a Middle Eastern origin.
Most research uses both primary and secondary sources. They complement each other to help you build a convincing argument. Primary sources are more credible as evidence, but secondary sources show how your work relates to existing research.