What major event did Anne Boleyn's marriage to Henry VIII contribute to in England?

Anne Boleyn's marriage to Henry VIII is significantly linked to the start of the English Reformation. This critical event was initiated when Henry sought to annul his marriage to Catherine of Aragon in order to marry Boleyn, who he hoped would bear him a male heir. When the Pope refused to grant the annulment, Henry broke away from the Roman Catholic Church, leading to the establishment of a separate Church of England with the king as its supreme head.

This pivotal moment not only marked the beginning of a series of religious reforms and shifts in power in England but also set off wider changes across Europe regarding religion and governance. The impact of this decision was profound and lasting, influencing the religious landscape of England and the subsequent trajectory of the Reformation movement, as many people were compelled to question the practices of the Catholic Church in light of Henry's actions.

While Boleyn's marriage also indirectly contributed to the establishment of the Anglican Church, which emerged from the break with Rome, the start of the English Reformation as a broader movement is the more accurate answer in the context of the question, as it encapsulates the initial spark that led to extensive theological and political changes.