Hello. You forgot to present the text to which this question refers. The text is:
In my opinion, if we are drawn into the world war—whether through Atlantic or Pacific hazards—we shall swiftly surrender to the equivalent of military dictatorship ourselves and we shall come from the conflict (no matter how victorious) into bankruptcy. No one can study the mobilization plans which are ready and waiting in the event of our entry into war—no one can study the vast emergency powers which the President can immediately exercise—without shuddering at their net effect upon American freedom. Meanwhile, no one can contemplate what it would mean in terms of money—if we were to add the pyramid cost of even a little war to our present debt burden which already crowds the statutory limit—without realizing that national bankruptcy would follow in the gloomy wake of our participation in any of these conflicts. All of this, furthermore, is entirely secondary and subordinate to the fact that an overwhelming percentage of the American People (regardless of their sympathies) insist that we shall never export another American soldier. I am opposed to American participation—directly or indirectly—in any of these wars; and since I do not intend to take "the last step" in this bloody direction, I also do not propose to take the "first step" or any other step which would lead in this direction—unless and until the American national interest has to fight for its own existence.
Answer and Explanation:
Vandenburg's objections are to the US participation in a war. This is because he believes that, regardless of victory or defeat, the chances that a dictatorship will be established in the country are very high and this would promote the loss of freedom that Americans have. He believes in the chances of a dictatorship, because in the midst of a war the president would have access to a lot of power, especially emergency powers.
Furthermore, he believes that a war would lead the country to complete bankruptcy, as it would spend huge amounts of public money, ruin the economy and cause several economic problems.