The main goal of this Master's thesis is the investigation and the analysis of management decisions of the company AHT Cooling Systems GmbH in the USA. The aim is to determine a congruence between the literature and the situation found in the company. The focus is placed on the internationalization process, to answer the questions about why (causality of internationalization), how (modality), when (temporality) and where (locality) in relation to the location decisions for the US business expansion on the basis of the “follow-your-customer-strategy”. Three research questions were investigated, which resulted from the synthesis of the respective problems, to analyse the five interviews critically. Accordingly, the focus is on AHT Cooling Systems GmbH, which has made the decision, to comprehensively accompany the market entry of one of its key customers as a technology partner in the USA. In addition, the company wants to include the experience gained on its home market in Europe to the expansion in the USA. The focus of the master thesis lies on the selection of the strategic tools necessary and the underlying decisions inclusive a location discussion for the satisfaction of the extended customer needs. Furthermore, the focus is on the challenges and influencing determinants of the company's strategy.In summary, the AHT Cooling Systems GmbH has changed from a medium-sized company to a global company group with a clear expansion strategy, based on several strategic foundations, like organic growth, a high degree of innovation and a high quality product range. By the decision of the key customer, the company has made the decision, to accompany the expansion to achieve the companys strategic goal.