Europe is not the only region where tower operators are gearing up for consolidation and expansion. In the USA, where the pure-play towerco model dominates the infrastructure landscape, the major operators are diversifying their activities in various ways, in the face of the merger of major customers (T-Mobile USA and Sprint being the latest); aggressive negotiation on the part of the remaining tenants; and new competitors, particularly in small cell and enterprise sectors. The three main US towercos – American Tower, Crown Castle and SBA – have taken different approaches to expanding their businesses in recent years. American Tower has been the most reliant on international growth, and it started this year with the purchase of Telefónica’s tower business, Telxius,…