Kathryn Harris who ran Florida's elections and was a Bush campaigner (major conflict of interest) delayed the manual recount as much as possible. She pretended that it would be against the law to do one, even though it says right in Florida's code that manual recounts are available, the bottom line is to determine the intent of the voter and count votes, and manual recounts had already been used in Florida in the past. Once the matter finally made it to the Florida Supreme Court and the court told election officials to start counting manually, Bush sued to the US Supreme Court to stop the process, which they did. Then, they allowed only a tiny amount of time to finish the manual recount, making it impossible to complete. Essentially, they appointed Bush.
Machine recounts, which Harris pretended were enough don't take chads into account (pieces of paper that didn't fully detach), even though chads (dimpled/pierced or hanging) are a common problem with punch card ballots. The Florida Supreme Court finally said "count the votes manually, determine the intent of the voter as the code says, et cetera. This was after major delaying tactics by Harris and Fox "News" calling the election for Bush based on fake numbers to put pressure on Gore to concede. The "states rights" (Bush supporting conservatives) justices voted 5-4 (liberals/moderates) to stop the recount in order to delay further and make it harder (impossibly eventually) to do the recount. Gore offered to the Bush campaign a full manual recount of the state and Bush refused. Then Gore asked for a recount of counties Democratically leaning using punch card ballots (the Republican leaning counties mostly had the more accurate optical scanners).
In addition to the Harris/Supreme Court/Fox/Bush business, George's brother Jeb Bush got a company to create a "felon list" to deny blacks the ability to vote, and the list was not accurate at all. The badly designed and illegal (yes, illegal) butterfly ballot also cost Gore many more votes than Bush's declared "win" margin. Many many more. This isn't just speculation. Because of the ballot's bad design, voters voted in statistically impossible numbers for a socialist candidate instead of Gore, a candidate who got basically no voters elsewhere in Florida.
The Republican Party staged a fake riot at one of the election centers where the manual recount was taking place in order to get it stopped, by making it seem like there was general public outrage about the process. The riot was covered by the mainstream media as being legitimate and James Carlyle (of the Carlyle Group which got a no-bid contract from Bush later for Iraq) was on TV constantly propagandizing for Bush. The media didn't focus enough on the fact that Florida law gave election officials wide latitude to count votes with chads, as well as over-votes. Determining the intent of the voter was the charge, in order to count votes as the ideal, not throw them out as the ideal.
Chief Justice Rehnquist, a conservative Bush supporter who presided over the US Supreme Court during the election suit, not only voted to stop the count and then to short-circuit the process, preventing its completion, he later came out with a letter to the public asking them to forget about the Bush vs. Gore decision the court made (because it was faulty). How convenient to apologize after making the decision, pretending not to have known the rulings were faulty.
It turns out that if all counties had been manually recounted, Gore would have been declared the winner. So, in essence, Bush was appointed by Kathryn Harris, Jeb Bush, and The US Supreme Court's 5 conservative justices.