No. They are not. The powers are divided in the US Constitution for good reason.
Presidential powers were expanded
One notable example of Thomas Jefferson expanding presidential power is his decision to proceed with the Louisiana Purchase in 1803. Despite his strict interpretation of the Constitution, which limited federal authority, Jefferson seized the opportunity to acquire vast territory from France, effectively doubling the size of the United States. He justified this action by emphasizing the need for national growth and security, setting a precedent for future executive actions that expanded presidential authority beyond strict constitutional limits.
The Roosevelt Corollary expanded the Monroe Doctrine by asserting the US's right to intervene in Latin America to maintain law and order. This policy justified US intervention in the region to protect its economic and strategic interests.
The expansion of the United States may have been needed, but the way in which hundreds of thousands of Native Americans were displaced and mistreated could never be justified. History shows how the horrible mistreatment of the people who lived here first is a mark that will forever sully the name of our great nation.
President George W. Bush expanded the Monroe Doctrine's principles through his foreign policy, particularly in Latin America and the broader context of the War on Terror. He emphasized a proactive approach to security, asserting the U.S. right to intervene in countries that were perceived as threats or harboring terrorism. This expansion reflected a shift from the original doctrine's focus on colonial non-interference to a more interventionist stance, aimed at promoting democracy and combating terrorism in the Western Hemisphere.
Andrew Jackson expanded presidential power by using the veto more often. Before him, presidents only used the veto if they believed a bill passed by Congress to be unconstitutional and issued few vetoes. Jackson vetoed bills that he believed were bad for the country and so very vetoed many more. He also stood up to the Supreme Court and sometimes ignored their decisions.
Israel's borders grew in 1967 through the Six-Day War, which was a pre-emptive war with a justified causus belli. Please read more about the Six-Day War in the Related Questions.
Following the September 11, 2001, terrorist attacks, the U.S. response to international terrorism included the launch of the War on Terror, characterized by military operations in Afghanistan to dismantle al-Qaeda and remove the Taliban from power. The U.S. also implemented significant changes in domestic security through the establishment of the Department of Homeland Security and the passage of the USA PATRIOT Act, which expanded surveillance and law enforcement powers. Additionally, the U.S. sought to build international coalitions to combat terrorism globally, emphasizing intelligence sharing and counter-terrorism efforts.
Spain was no more or less justified in their foreign conquests than the numerous other peoples who have conquered and expanded their empires. During the period of primary Spanish conquest (1500s-1600s), there were numerous other empires around world that were expanding, like the Ottoman Empire, Safavid Empire, Mughal Empire, the Portuguese Empire, the Songhai Empire, and the Japanese Shogunate.
President Jefferson used new presidential powers.
Expanded
He used and expanded on the Roosevelt Corollary, which allowed the US to interfere with the business of other nations if they were "politically or financially unstable." He justified his protecting Panama Canal with this. The dollar diplomacy was the term given to his policy of guaranteeing loans made to foreign countries.