Final answer:
The growth of the European Union has been facilitated by the economic force of globalization, which encourages cooperation amongst highly industrialized nations with a high standard of living and shared cultural heritage.
Step-by-step explanation:
The human geographic factor that has facilitated the growth of the European Union (EU) is the economic force of globalization. This process has encouraged nations within Europe to collaborate for mutual benefit, recognizing that unified, they form a major economic power. The region's high level of industrialization, standard of living, and shared histories and cultural connections have all contributed to this unity.
Historical development patterns, including contributions from ancient Greece and Rome, have established a foundation for democracy, law, and organization which have been influential in shaping European cooperation. The physical geography of Europe with its favorable climate, access to rivers and seas, and natural resources supported the development of the Industrial Revolution, leading to an urban society ready for integration.
The EU itself is an example of supranationalism, where centripetal forces work towards unity among its member states. However, it is also affected by devolutionary forces that challenge such unity. Overall, globalization remains the key factor behind the European Union's growth, as it allows member states to pool resources, labor, and energy, and create a strong economic bloc with high standards of living.