This introductory section sets the stage by providing necessary context for the study. It explores the pre-existing state of US-Turkish relations before 2009, highlighting key areas of cooperation and divergence. Further, it outlines the research questions which will guide the subsequent analysis. This will involve the introduction of the study's scope, including the timeframe and methodologies used, to provide the reader with a clear roadmap of the research ahead. Key concepts such as 'strategic interests' and 'geopolitical alignment' will be defined to ensure a shared understanding amongst the target audience.

This section assesses the character of the US-Turkish relationship before the commencement of the Syrian Civil War in 2011. It will examine the historical ties between the two nations, which have been allies in NATO, their political, military, and economic cooperation. Also, this section will discuss previous areas of disagreement and tension, such as the Iraq War and Turkey’s relations with regional actors. This will provide a baseline for understanding how the Syrian conflict later impacted the existing framework of the bilateral relationship, including cooperation in fields such as counter-terrorism, and how it affected cooperation, particularly in fields such as counter-terrorism.

This section provides an overview of the Syrian conflict, tracing its development from early protests to full-scale civil war. It examines the involvement of regional powers, including Iran, Saudi Arabia, and Russia, and their impact on both the conflict and US-Turkish dynamics. Furthermore, the analysis will focus on crucial events such as the rise of ISIS, the shifting alliances within Syria, and the humanitarian crisis. This exploration will provide the necessary context for understanding the varied interests of the US and Turkey, against the backdrop of a prolonged and complex conflict and the geopolitical fallout within the region.

This section delves into Turkey’s specific interests and objectives in Syria. Focus will be given to Turkey's concerns regarding the Syrian Kurds and the security of its southern border, as well as its support for certain opposition groups. Also, the section will explore how this position diverged from the US approach, particularly regarding the support for groups such as the YPG (Kurdistan Workers Party). This is essential for understanding the source of friction and the challenges in aligning strategies. The exploration into the Turkish perspective provides essential context for the complexities in US-Turkish relations.

This section analyzes US policy choices regarding the Syrian conflict. This is in the context of the goals of counter-terrorism, humanitarian efforts, and stability in the region. This section will discuss the US support for the Syrian opposition, and the shifts in its strategy over time. Also, this section will analyze the implications of these policies on US-Turkish relations. This part of the research highlights the factors that have strengthened or weakened the partnership between the two countries, including diplomatic efforts, military collaboration, and economic considerations.

This section examines the forms that occurred in military and diplomatic cooperation between the US and Turkey during the timeframe of the research. It assesses joint military operations, intelligence sharing, and arms sales. The analysis includes a discussion of diplomatic exchanges, including high-level meetings and negotiations, and assesses both success and failure in these fields. Emphasis will be placed on the disagreements that arose, especially those concerning the support for certain groups. This detailed analysis underlines the complexities of managing the alliance amid the conflicts.

This is an assessment of the long-term impact that the Syrian conflict had on the relationship between Turkey and the US. It covers the changes in trust, cooperation, and the strategic alignment between the two nations. This section will also address implications such as how the conflict influenced regional power dynamics and the future of NATO. Furthermore, the section will explore the way the shifts in relationships, economic ties, or the political landscape have affected the relationship between the two countries. This part intends to provide a comprehensive look at both the negative and positive consequences of how the conflict changed the relationship.

This final section summarizes the main findings of the research, as well as the effects of the Syrian conflict on US-Turkish relations. It will synthesize the key points from each section, highlighting how the conflict reshaped the dynamics of the partnership. It offers concluding thoughts on the challenges and opportunities for future cooperation and the wider implications of the events. Moreover, this section will underline the significance of the research in helping understand the management of international alliances and geopolitical shifts. This helps to provide the reader with a cohesive overview of the research.

This section offers a comprehensive list of sources used in the research, providing full bibliographic details of all the information referenced in the study. These sources will vary and may include academic books, various journals, government documents, and publications from reputable think tanks. This will allow the reader to examine the research and conduct further studies that focus on the subject. The list of the sources would be arranged in a consistent, easily accessible format.