The final contingent of United States troops has departed Iraq, marking the end of a military presence that began in 2003. The withdrawal concludes over two decades of American involvement, which initially aimed to depose leader Saddam Hussein but subsequently navigated a complex series of crises and a cycle of violence that significantly weakened the Iraqi state.

The departure leaves Iraq to confront a new security landscape, prompting critical questions about its capacity to independently manage future challenges. While the US military's presence is credited by some with preventing state collapse, it is also implicated in contributing to the subsequent instability that plagued the nation. The Iraqi government now faces the imperative of self-reliance in ensuring its security and stability.

This transition raises concerns among geopolitical analysts regarding Iraq's ability to fill the security vacuum left by the US forces. Experts highlight the ongoing need for robust internal security mechanisms and the potential for external actors to exploit any perceived weakness. The dynamics of regional powers and their influence on Iraq's stability are also under scrutiny.

The long-term implications of the US withdrawal are multifaceted. The Iraqi government's effectiveness in maintaining order, combating lingering extremist groups, and managing internal political divisions will be crucial. The departure could also reshape regional alliances and influence the geopolitical balance in the Middle East, potentially creating opportunities for other international players.

Historical context suggests that the post-2003 period was marked by significant internal conflict and the rise of various armed groups, including the so-called Islamic State. The Iraqi security forces have undergone extensive training and re-equipment, but their sustained capability in the absence of direct US support remains a key point of discussion.

Analysts from institutions like The Soufan Center and Kuwait University, specializing in Middle East geopolitics and Gulf security, have voiced differing perspectives on Iraq's readiness. While acknowledging the progress made by Iraqi forces, they emphasize the persistent complexities of the security environment and the potential for renewed instability.

The withdrawal also brings into focus the role of neighboring countries and their potential impact on Iraq's future. Questions linger about whether these nations will support or undermine Iraq's efforts to establish lasting security and sovereignty.

Ultimately, the success of Iraq's independent security management will depend on a confluence of factors, including the strength and unity of its government, the effectiveness of its security apparatus, and the broader regional geopolitical climate. The coming months and years will be critical in determining whether Iraq can successfully navigate these future challenges on its own.