Which of the following 20th century trends significantly impacted the exhibition industry?

The growth in the number of associations significantly impacted the exhibition industry during the 20th century for several reasons. As various industries expanded and diversified, many professional and trade associations emerged to serve specific sectors. These associations often organized exhibitions and trade shows to help their members connect, showcase products, and share knowledge.

The increase in associations led to a broader variety of trade shows, catering to niche markets and creating more opportunities for exhibitors and attendees alike. Each association often brought together industry professionals who might not have connected otherwise, enhancing networking and collaboration opportunities. This trend fostered innovation, as different sectors shared insights and technologies through these exhibitions. As a result, the overall growth of associations played a crucial role in shaping the landscape of the exhibition industry, promoting professional development, and facilitating commerce.

In contrast, a decrease in participation, reduction in technology, or a focus on domestic exhibitions would suggest a contraction or limitation of the industry's potential and would not support the dynamic expansion observed during this period.