The judicial branch enforces the law; making sure it is carried out and people oblige to it. They also determine if the policy is constitutional or unconstitutional.
Lots of civil wars and the invasions of barbarians like the huns and other tribes brought down the empire since the senator could not get along and refused to fix the problem.
Climate change that caused a severe drought.It is also theorized that the Hittite's cities were destroyed by earthquakes.
Following the German invasion of Poland on September 1, 1939 hundreds of thousands of Jews and other Polish citizens fled eastward ahead of the advancing German army; many refugees found at least temporary safety in Lithuania. Options for escape were limited and required diplomatic visas to cross international borders. One route was through Asia using a combination of permits issued by foreign envoys responding to the refugee crisis: a bogus visa for entrance to the Dutch Caribbean island of Curaçao and a visa for transit through Japan.