The Greeks. I cannot recall what they were called then.
Answer:
An increase of property taxes
Explanation:
When property taxes rises, the selling prices of a housing area increases. Unfortunately that also means higher mortgage or rent payments for those that are already living in that housing area.
Property taxes could be raised for many different reasons, for example, you decided to add another building on your property or you bought more land.
Both dates occurred after two world wars, the 1920s preceded the World War 1 while the 1950s preceded World War 2.
The mass media similarity between these two is that it focused more on entertainment and advertisements. Because the war ceased already, films and entertainment shows flourished greatly.
The correct answer is Japan
Japan was unsatisfied with Chinese business deals because they all had equal rights to trade with China because of the open door policy. Japan sought to end this and make sure that they got the upper hand in trading with China by ending the open door so they invaded Manchuria and started running the place the way that they wanted to.