D. Remained poor.
They experienced a period of economic stagnation following the independence. Making a lot of people remained poor despite being free from the European colonization. They need some time before they eventually make adjustments to implement a proper political system in place and develop their economy.
B. Because an invasion of japan's mainland would have meant the loss of thousands of American lives, many analyst's discussed it and said between 500,000 - 1 million lives could have been lost during the invasion due to how dug in and defended Japan would have been. Including their miles and miles of underground tunnels
<span>economic opportunity and freedom from government control</span>
I would say B monotheism and C writing system not yet deciphered
hope this helps