Answer:
Hitler's invasion on Poland in September 1939 is what made Great Britain and France to declare war against Germany.
Explanation:
Hitler hoped to force Great Britain's surrender by a mass bombing on Britain.
It confirmed the level of effectiveness of existing wartime equipment during the war. It opened the door to new ideas and development of combat war machinery.
Answer:
The Persian Wars began because a group of Ionian city-states rebelled against Persian rule so Persia decided to attack the mainland of Greece.
Explanation:
The Persian Wars began because a group of Ionian city-states rebelled against Persian rule so Persia decided to attack the mainland of Greece.due to this the citizenship and allegiance to Greece changed after the Persian war.
The thermocline is the name for the layer of the ocean where the temperature drops with depth faster than in other layers, True.
Answer: (A) An increase in the warfare between European states over possession of overseas colonies.
