Generally speaking, a civilization whose impact can be felt on history for a very long time can be called a "lasting civilization", since the things they put into effect have "lasted" throughout the years.
Answer:
A weak government is poorly prepared to handle the demands of a crisis such as a natural disaster.
The covenant that warrants against claims of third parties is quiet enjoyment
If we are talking about the second world war, then then answer would be that the Chinese kept the Japanese busy fighting them, and in turn, about 800,000 of their troops. This gave the Americans, who were the main force against the Japanese during this time, a little breathing room with which to continue military operations.
Hope this answered your question.