Arrange the following aspects of Europe's integration in the correct order of their appearance.

A. Marshall Plan
B. Lisbon Treaty coming into force
C. Croatia becomes the 28th member of EU
D. Schengen Agreement abolishing border controls amongst the EU members
E. Referendum in Britain that initiated the process of Britain's exit from the EU

A, D, B, C, and E

The correct answer is Option 2 - A, D, B, C, and E

A. Marshall Plan - 1945
D. Schengen Agreement abolishing border controls amongst the EU members - 1985
B. Lisbon Treaty coming into force - 2009
C. Croatia becomes the 28th member of EU - 2013
E. Referendum in Britain that initiated the process of Britain's exit from the EU - 2016

Explanation:

European integration after 1945 was aided by the Cold War. America extended massive financial help for reviving Europe’s economy under what was called the ‘Marshall Plan’. The US also created a new collective security structure under NATO

1985 June: The Schengen Agreement abolishes border controls among the EC members.

2009 December: The Lisbon Treaty came into force.

2013: Croatia becomes the 28th member of the EU.

2016: Referendum in Britain, 51.9 per cent voters decide that Britain exit (Brexit) from the EU.