Determining fault for the beginning of the American Revolutionary War is a complex and historically debated issue. The conflict arose from a combination of factors, including colonial grievances, British policies, and a series of events that escalated tensions. Blaming any single party oversimplifies a multifaceted historical context, but it's possible to identify key contributors:

1. British Policies: Many colonists believed that the British government bore a significant portion of the responsibility. British policies such as the Stamp Act, Townshend Acts, and the Intolerable Acts were seen as oppressive and unjust. These measures imposed taxes and restrictions on the colonies without colonial representation in the British Parliament, which fueled colonial discontent and calls for independence.

2. Colonial Grievances: The American colonists had legitimate grievances against the British Crown. They argued that their rights as English subjects were being violated, particularly their right to self-governance and their opposition to taxation without representation. The colonists felt their interests were ignored by the distant British government.

3. Escalating Events: Tensions between British troops and colonial militias escalated due to incidents like the Boston Massacre in 1770 and the Battles of Lexington and Concord in 1775. These confrontations were often triggered by misunderstandings and conflicting orders, but they contributed to a growing sense of rebellion.

4. Leadership and Advocacy: The efforts of influential colonial leaders like Samuel Adams, John Adams, and Thomas Paine played a crucial role in shaping public opinion and promoting the idea of independence. Their advocacy and writings helped to galvanize the colonial population.

5. External Factors: International events, such as the involvement of European powers like France and Spain in support of the American cause, also played a role in the war's outbreak. These external influences influenced the course of the conflict.

In summary, attributing fault for the start of the American Revolutionary War to a single party is overly simplistic. The conflict was the result of a complex interplay of factors, including British policies, colonial grievances, escalating events, leadership, and international influences. It is more accurate to view the Revolutionary War as a culmination of tensions and events that led to a widespread desire for independence among the American colonies.