According to Figure 1.2, intra–European Union trade accounts for a huge proportion of EU trade. What factor or factors might account for this fact?

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Asiab exports: $19.9 billion to U.S. & Canada ($4.9) European Union exports: $73.4 billion to European Union ($4.4) to U.S. & Canada ($6.7) to Middle East ($2.2) to Latin America ($3) to ROW ($7.6) to European Union ($43.7)- to Africa ($1.1) to Asia ($4.9) to Asia ($6.4) to Africa ($5.3) U.S. & Canada exports: $35.5 billion to European Union ($9.7) to U.S. & Canada ($10.3) to European Union ($3.4) to Africa ($1.2)- -to Middle East ($0.9) to Latin America ($4.6) to U.S. & Canada ($0.9) to Asia ($6.2) to ROW ($2.6) to European Union ($5.9) Latin America exports: $12 billion to Africa ($0.2)- Africa exports: $8.4 billion C to Middle East ($0.1) to Latin America ($0.03) to ROW ($0.47) to Asia ($0.5) -to Africa ($0.5) Middle East exports: $6.6 billion to U.S. & Canada ($0.4) to Middle East ($0.3) -to Latin America ($0.2) to ROW ($0.6) -to Asia ($1.5) to European Union ($4.0) - to U.S. & Canada ($4.6) to Africa ($0.1) to Asia ($0.6) to ROW ($0.9) to Middle East ($0.1) to Latin America ($1.8) to Middle East ($0.6) to Latin America ($0.6) to ROW ($1.9)