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The Monroe Doctrine allowed the president to extend his diplomatic power by specifying that he can provide for defense against other nations. Prior to this document’s establishment, the Neutrality Proclamation set the skeleton of the President’s diplomatic powers as independent from Congress as well as for the greater good of the nation. Although the Monroe Doctrine (1823) asserted these concepts, it also filled in this skeleton’s gaps by warning the Old World to sustain from interfering with North America. Any breach of the doctrine would be received as an “act of aggression,” and thus unfriendly force would ensue.
By purposefully not declaring neutrality from Europe, but rather declaring defense against Europe, Monroe solidified Washington’s trailblazing precedence of executive authority and even widened it to apply to brave defense against foreign nations.

The following is a suggested edit for your text:

The Monroe Doctrine expanded the diplomatic powers of the president by specifying that he had the authority to provide for defense against other nations. Prior to the establishment of this document, the Neutrality Proclamation established the framework for the president's diplomatic powers, which were intended to be independent from Congress and serve the best interests of the nation. While the Monroe Doctrine (1823) affirmed these principles, it also addressed certain gaps in this framework by warning the Old World against interfering in North America. Any violation of the doctrine would be interpreted as an "act of aggression," and the United States would respond with necessary force.
By deliberately choosing to not declare neutrality from Europe but instead proclaiming defense against Europe, Monroe solidified Washington's pioneering example of executive authority and expanded it to encompass a steadfast defense against foreign nations.

Sure! Here's an edited version of your passage:

The Monroe Doctrine expanded the president's diplomatic authority by granting the power to defend against other nations. Before the establishment of this document, the Neutrality Proclamation established the foundation of the president's independent diplomatic powers, which aimed to serve the best interests of the nation. While the Monroe Doctrine (1823) reinforced these principles, it also addressed the gaps in this foundation by warning the Old World against interfering with North America. Any violation of the doctrine would be considered an "act of aggression," leading to a hostile response.

By intentionally refraining from declaring neutrality towards Europe and instead emphasizing defense against Europe, Monroe further solidified executive authority, following the precedent set by Washington, and extended it to include the courageous defense against foreign nations.