Which was the main goal of the open door policy?

to ensure china maintained its independence
to protect us trade interests in china
to ensure imperialist countries could trade equally with china
to guarantee the united states exclusive trading rights with china

To ensure imperialist countries could trade equally with China.

based on this information, i would advocate against sweatshop labour because it exploits workers in unsafe working conditions with little pay. though sweatshops produce inexpensive goods, they harm the environment, workers, and often use unsafe materials to make consumer goods.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).