I believe A.
When US troops moved north of it, the Chinese decided to fight. It was the location of the Yalu River boundary between North Korea and China.
<span>The geography of Germany was a challenge to the country during WW1 due to the fact that the soldiers had to fight the conditions as well as the enemies. German soldiers had to fight a many literal uphill battles and deal with harsh weather conditions. Germany was also isolated from the sea trading routes because of Russia.</span>
Answer:
It strengthened an economy that had been weakening. It strengthened an already strong economy.
Explanation:
im 90% sure this is correct i hope this helps